<!DOCTYPE html>
<html>
<head>
	<style>
	p { color:red; margin:4px; }
	b { color:blue; }
	</style>
	<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
	<p></p>
	<select id="single">
		<option>Single</option>
		<option>Single2</option>
	</select>
	<select id="multiple" multiple="multiple">
		<option selected="selected">Multiple</option>
		<option>Multiple2</option>
		<option selected="selected">Multiple3</option>
	</select>
<script>
	function displayVals() {
		var singleValues = $("#single").val();
		var multipleValues = $("#multiple").val() || [];
		$("p").html("<b>Single:</b> " + singleValues + " <b>Multiple:</b> " + multipleValues.join(", "));
	}
	$("select").change(displayVals);
	displayVals();
</script>
</body>
</html>